channels conversions triggered simultaneously by TIM8 with a 100mS period.
After a couple of discussions with AI

The issue is it hangs on calling the ADC routine readADCValues(); (when I comment it out it prints out zero results).
If you perhaps may spot an obvious issue there I would appreciate..
Code: Select all
#include <Arduino.h>
#include <stm32f3xx_hal.h>
// Define ADC pins
#define ADC1_CHANNEL_PIN PA0 // Example: ADC1_IN1 (PA0)
#define ADC2_CHANNEL_PIN PA1 // Example: ADC2_IN2 (PA1)
// Timer configuration
#define TRIGGER_TIMER TIM8 // Use Timer 8 for triggering
// Global variables to store ADC values
volatile uint16_t adc1_value = 0;
volatile uint16_t adc2_value = 0;
// Handles for ADCs and Timer
ADC_HandleTypeDef hadc1;
ADC_HandleTypeDef hadc2;
TIM_HandleTypeDef htim8;
void setupADC() {
// Enable clocks for ADCs, GPIO, and Timer
__HAL_RCC_ADC12_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_TIM8_CLK_ENABLE();
// Configure GPIO pins for ADC (PA0 for ADC1, PA1 for ADC2)
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
// ADC1 initialization
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T8_TRGO;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
HAL_ADC_Init(&hadc1);
// Configure ADC1 channel (PA0)
ADC_ChannelConfTypeDef sConfig = {0};
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_61CYCLES_5;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
// ADC2 initialization
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T8_TRGO;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
HAL_ADC_Init(&hadc2);
// Configure ADC2 channel (PA1)
sConfig.Channel = ADC_CHANNEL_2;
HAL_ADC_ConfigChannel(&hadc2, &sConfig);
// Enable dual ADC mode for simultaneous sampling
ADC_MultiModeTypeDef multimode = {0};
multimode.Mode = ADC_DUALMODE_REGSIMULT;
HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode);
// Enable ADCs
HAL_ADC_Start(&hadc1);
HAL_ADC_Start(&hadc2);
}
void setupTimer() {
// Configure TIM8 for trigger generation
htim8.Instance = TIM8;
htim8.Init.Prescaler = (SystemCoreClock / 10000) - 1; // Set timer clock to 10 kHz
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = 1000 - 1; // Trigger every 100 ms (10 Hz)
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim8);
// Configure TIM8 to generate TRGO (trigger output)
TIM_MasterConfigTypeDef masterConfig = {0};
masterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE; // Trigger on timer update event
masterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim8, &masterConfig);
// Start the timer
HAL_TIM_Base_Start(&htim8);
}
void readADCValues() {
// Wait for conversion to complete
while (!__HAL_ADC_GET_FLAG(&hadc1, ADC_FLAG_EOC)) {}
while (!__HAL_ADC_GET_FLAG(&hadc2, ADC_FLAG_EOC)) {}
// Read ADC values
adc1_value = HAL_ADC_GetValue(&hadc1);
adc2_value = HAL_ADC_GetValue(&hadc2);
}
void setup() {
Serial.begin(9600);
setupADC();
setupTimer();
Serial.println("Setup complete. Starting ADC sampling...");
}
void loop() {
// Read ADC values (updated after each timer-triggered conversion)
readADCValues();
// Print ADC values
Serial.print("ADC1 Value: ");
Serial.print(adc1_value);
Serial.print("\tADC2 Value: ");
Serial.println(adc2_value);
//delay(100);
}